The Duke and Duchess of Cambridge are on their weeklong royal tour of India

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Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge meet young entrepreneurs during a visit to Mumbai on April 10, 2016 in Mumbai, India.

The Duke and Duchess of Cambridge met with young entrepreneurs in India's financial capital of Mumbai on Monday to speak with the country's next generation of business leaders about their start-up ideas.

On the second day of their weeklong royal tour of India, Prince William and his wife, the former Kate Middleton, spent nearly an hour with the entrepreneurs and the venture capitalists likely to fund some of their enterprise ideas.

They were also due to pay respect to Mohandas K. Gandhi and tour a museum near the spot where India's independence leader was assassinated.

In the evening, the couple was to attend a garden party to celebrate Queen Elizabeth's 90th birthday, which is April 21. William was expected to speak to the large gathering of prominent Indians at the reception about his grandmother, who is Britain's longest-reigning monarch.

William and Kate are traveling without their two children — 2 1/2-year-old Prince George and 11-month-old Princess Charlotte. They had taken George to Australia with them in 2014 on their last royal tour.

On Wednesday, the royal couple will sit down for lunch with Indian Prime Minister Narendra Modi, before traveling to the Kaziranga National Park, home to two-thirds of the world's Indian one-horned rhinos, in the northeastern state of Assam.

They'll also take a one-day trip to neighboring Bhutan at the invitation of the Himalayan kingdom's King Jigme Khesar Namgyal Wangchuck and Queen Jetsun Pema.

William and Kate will then head back to India, where they'll wind up their tour with a visit to the Taj Mahal, retracing the steps of a 1992 visit to the monument of love by William's mother, the late Princess Diana.